Smoke-consuming furnace for steam-generators



(No Model.)

G. R. URIDGE. SMOKE OONSUMING FURNACE FOR STEAM GENERATORS.

No. 373,502. Patented Nov. 22, 1887.

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UNITED STATES PATENT @rrifcn.

GEORGE E. URIDGE, OF DETROIT, MICHIGAN.

SMOKE-CONSUMING FURNACE FOR STEAM-GENERATORS.

. SPECIFICATION forming part of Letters Patent No. 373,502, dated November 22, 1887.

Application filed May 12, i887. Serial No. 237,958.

To all whom it may concern:

Be it known that I, GEORGE E. URIDGE, of Detroit, in the county of \Vayne and State of Michigan, have invented new and useful Improvements in Boiler-Furnaces; and I do hereby declare that the following is a full,

clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to certain new and useful improvements in boilerfurnaces.

As furnaces for steamgenerators are ordinarily constructed for burning coal, a large proportion of the products of combustion pass to the exitflne or smoke-stack nnconsumed, and are therefore a dead loss. This more es pecially appertains to the use of soft or bituminous classes of coal, which in the progress of combustion throw off extraordinarily large quantities of gases, which might be utilized to the great saving of fuel provided the proper kind of furnaces and appliances therefor are provided.

The invention consists in the peculiar construction, arrangement, and combination of the various parts, as more fully hereinafter described, shown, and claimed.

Figure 1 is a longitudinal central sectional view of my improved furnace. Fig. 2 is a cross-section on the line 00 as in Fig. 1.

In the drawings which accompany and form a part of this specification, A represents the brick walls of a boiler'furnace, adapted to sustain the boiler 13 in position. This furnace is provided with an ash pit, C, grate-bars D, combustion-chamberE, feed-door F, and draftdoor G, all of the usual construction, the rear end of such gratebars resting upon the bridgewall H. Extending laterally across the fur nace from side to side and above the bridgewall are two air-chambers, I and I, opening through the side walls of the furnace, such openings being provided with doors J. The former of these air-chambers has perforations in the top to discharge air when the opening leading into such chamber is disclosed into the products of combustion as they pass from the combustion-chamber E over the top of the bridge-wall, and the chamber 1 has a similar discharge in its rear wall for asimilar purpose, except that the discharge of air through such rear wall is into another combustiouchamber,

(No model.)

K, which is provided with grate-bars L, one end of which rests upon the bridge-wall and the other upon the fire-brick wall M, supported by an arch, N, leading into a smokechamber, which communicates with the smokestack directly or through the fines of a boiler when a boiler of such construction is used. Above the wall M, which may be termed a subsidiary bridge-wall under certain circumstances, is a directdraft opening, P, having a damper, It, secured to a suitably-journaled rock-shaft, S, one end of which projects through the side wall of the furnace and has a handle or hand-wheel, T, attached thereto for the purpose of operating the damper R.

In the side wall of the auxiliary furnace, composed of the combustionchamber K,gratebars L, and ash-pit U, there is arranged a feeddoor, V, through which coal may be fed onto the grate-bars, and a draft and ash-pit door,W.

Fire is made upon the grate-bars D with the direct draft P open, and the combustionchamber E is designed to be somewhat longer than the combustion-chamber K. A smaller fire is made upon the grate-bars L, and as soon as the firein the latter becomes incandescent the direct-draft damper R should .be closed, when the products of combustion from the chamber E will pass over the top of the bridge-wall H, surmounted by the air-chambers, and the openings into such airchambers being disclosed sufficient air will be mingled with such products of combustion to render their ignition and. perfect combustion practicable as they pass down through the fire upon the grate-bars L and through the arch N- into the smoke-chamber O.

By this construction and operation nearly or quite all the gases thrown off from the coal in the chamber E will be consumed and utilized under the boiler, thereby effecting great economy in fuel.

\Vhat I claim as my invention is- 1. In a boiler-furnace, and in combination therewith, an auxiliary combustionehamber having a grate-bar and an ash-pit with suitable openings or doors leading thereinto, and a double air-chamber upon the dividing bridgewall and perforated, 'as shown, substantially as and for the purposes described.

2. In a boiler-furnace, and in combination, a furnace under the front end of the boiler, a

subsidiaryfurnace in the rear of the furnace proper and divided therefrom by a bridgewall and alateral perforated air-chamber on the top thereof, a direct-draft opening con trolled by a damper operating from outside the furnace-wall, and a communication between the ashpit of the subsidiary furnace and the smoke-chamber, the parts being arranged and operating substantially as and for the purposes specified.

3. A boiler-furnace consisting of the ordinary combustion-chamber E, grate-bars -D,and ash-pit 0, having fuel-feed door and draftdoor, and bridge-wall extending laterally across said furnace from side wall to side wall, surmounted by two air-chambers, perforated as shown, communicating with the atmosphere through the side walls, a subsidiary combustion-chamber having grate-bars and ash-pit GEORGE R. URIDGE.

Witnesses:

H. S. SPRAGUE,

E. J. SOULLY. 

